Move empathy_call_window_get_preview_position around
Move empathy_call_window_get_preview_position around

https://bugzilla.gnome.org/show_bug.cgi?id=656268

Distrotech/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets